Product Description

How to understand the plastic flame retardant, the first to know about plastic combustion process.Plastic combustion process is an extremely complex thermal oxidation reaction, the combustion of the basic elements for the fuel and oxidizer with fire.It is generally believed that plastic combustion has experienced three stages as follows. The first stage, the thermal process.Heat from the external source of heat or fire in plastic phase too change (that is, from a solid into a liquid) and chemical change. The second phase, thermal degradation process.The process for the endothermic reaction, when the plastic absorbing enough heat to overcome some weak bonding energy between molecules within atoms, plastic degradation reaction.The essence of this reaction is in the presence of oxygen in the air of a free radical chain reaction, the outcome of the reaction will be flammable gas phase flammable objects such as a variety of monomer hydrocarbon, etc. The third stage, the ignition process.When the second stage of thermal degradation reaction of fuel concentration after reaching fire limit, meet with atmospheric oxygen, cause combustion. Overall flame-retardant mechanism is according to certain proportion to join in the plastics flame retardants and make oxygen index increases, resulting in a flame retardant effect.Oxygen index, of course, saying only that material flammability and flame retardant flame retardant, but should also adopt a series of parameters, such as the critical parameters of spontaneous combustion, heat energy, hot combustion temperature, etc.Generally speaking, contains the flame retardant plastic when burnt, flame retardant is various in different reaction area.For different materials, the effect of flame retardant may also be different.

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